Brass Prep
Prepare every surface. Control every dimension.
After resizing, cases stretch slightly. Trim every case to the same length — your reloading manual lists the trim-to length for your cartridge. Cases that are too long can crimp into the bullet and cause dangerous pressure spikes.
Trimming leaves a sharp edge on the case mouth. Chamfer the inside (so the bullet seats cleanly) and deburr the outside (so the case doesn't catch in the die). A few light passes is all it takes — you're removing an edge, not removing material.
Carbon and debris from firing affect primer seating and die life. Tumble or ultrasonic clean your brass before moving to the next bench. Wet tumbling with stainless pins also cleans primer pockets — a bonus if you skip the dedicated primer pocket step.
Brass weight is a proxy for internal case volume. Cases that weigh more have thicker walls and less internal volume — which affects powder charge pressure. Weigh every case, record the spread, and cull outliers beyond ±1 grain from the batch average.
A dirty or uneven primer pocket affects how deep the primer seats and how consistently it ignites. Clean and uniform every pocket. Uniforming removes the small ridge left by the flash hole punch during manufacturing.
The flash hole connects the primer pocket to the powder charge. Factory brass often has a burr or rough edge left from drilling. Deburring gives the primer flash a clean, consistent path into the powder — which means more consistent ignition.
- Trim-to length and verification measurements
- Brass weight: avg, min, max, spread
- Operations performed (trim, chamfer, deburr, clean)
- Primer pocket treatment (cleaned, uniformed, or skipped)
- Flash hole treatment (deburred or skipped)
- Cases culled from the batch — and why
